Just purchased at 1980 Datsun 720 Pickup, 2 liter. Engine was rebuilt, have aprox. 30,000 miles now. Has been sitting for approx. 2 years. We replaced plugs, plug wires, distributor cap and rotor. Cleaned the carb. including jets and they were totally gummed up. There was a short in the electrical system, the fusible link was burnt out but we replaced it. Everything seems to be working allright except it will not idle. It will start, but as long as you feed it gas it will run but once you let off the gas it will die. We have alreday tried adjusting the idle screw but didn't do a thing. Any suggestions would be appreciated.